A TV-video accelerated super-resolution processing method for reducing optical degradation from a frame included in single-frame TV video signals to restore the degraded TV video signals to the pre-degradation single-frame TV video signals,
- the TV-video accelerated super-resolution processing method characterized by comprising:
- (S1) a step of setting a maximum number of iterations;
- (S2) a degradation-index designating step of designating a degradation index suitable for a degradation state of the TV video while the TV video is being viewed;
- (S3) a PSF (Point Spread Function) preparing step of preparing a first PSF luminance distribution associated with the degradation index and a series of PSF luminance distributions derived from the first PSF luminance distribution and organized in association with numbers of iterations;
- (S4) a degraded-image preparing step of preparing, from single-frame TV video signals, a luminance distribution of a degraded image constituted of a single-frame luminance distribution;
- (S5) a restored-image-initial-value preparing step of setting the luminance distribution of the degraded image as an estimated luminance distribution of restored-image initial values;
- (S6) a PSF-size obtaining step of obtaining a PSF size, the PSF size referring to an image size that is the same among the series of PSF luminance distributions;
- (S7) a first resetting step of setting a counter that counts the number of iterations to 1;
- (S8) a first restored-image-initial-value correcting step of copying the estimated luminance distribution of the restored-image initial values, setting the estimated luminance distribution as an estimated luminance distribution of corrected-restored-image initial values, and correcting the estimated luminance distribution of the corrected-restored-image initial values on the basis of the PSF size;
- (S9) a PSF selecting step of selecting one PSF luminance distribution associated with the value of the counter from the series of PSF luminance distributions and setting the selected one as a PSF luminance distribution;
- (S10) a step of convolving the estimated luminance distribution of the corrected-restored-image initial values with the PSF luminance distribution to obtain a first function;
- (S11) a step of inverting the first function to obtain a second function;
- (S12) a step of multiplying the second function by the luminance distribution of the degraded image to obtain a third function;
- (S13) a step of multiplying the estimated luminance distribution of the restored-image initial values by the third function to obtain an estimated luminance distribution of a restored image;
- (S14) a step of incrementing the counter by 1;
- (S15) a step of testing a hypothesis that the value of the counter is greater than or equal to the maximum number of iterations, proceeding to step (S16) if the test result is false, and proceeding to step (S18) if the test result is true;
- (S16) a step of substituting the estimated luminance distribution of the restored image for the estimated luminance distribution of the restored-image initial values;
- (S17) a step of returning to step (S8);
- (S18) a step of outputting the estimated luminance distribution of the restored image as a luminance distribution of a maximum-likelihood restored image;
- (S19) a preparing step constituted of steps (S1) to (S7);
- (S20) a first image restoring step constituted of steps (S8) to (S18), and
- the TV-video accelerated super-resolution processing method also characterized by comprising:
- (S21) a first accelerated super-resolution processing step of completing the maximum number of iterations by executing iterations in ascending order of the index on S of steps in the preparing step S19 and the first image restoring step S20 and outputting the luminance distribution of the maximum-likelihood restored image;
- and
- (S22) a TV-video rendering step of rendering the luminance distribution of the maximum-likelihood restored image into single-frame TV video signals and outputting the TV video signals as super-resolution TV video signals.